import Browser from '../../core/Browser';

// @namespace SVG; @section
// There are several static functions which can be called without instantiating L.SVG:

// @function create(name: String): SVGElement
// Returns a instance of [SVGElement](https://developer.mozilla.org/docs/Web/API/SVGElement),
// corresponding to the class name passed. For example, using 'line' will return
// an instance of [SVGLineElement](https://developer.mozilla.org/docs/Web/API/SVGLineElement).
export function svgCreate(name) {
  return document.createElementNS('http://www.w3.org/2000/svg', name);
}

// @function pointsToPath(rings: Point[], closed: Boolean): String
// Generates a SVG path string for multiple rings, with each ring turning
// into "M..L..L.." instructions
export function pointsToPath(rings, closed) {
  var str = '',
    i,
    j,
    len,
    len2,
    points,
    p;

  for (i = 0, len = rings.length; i < len; i++) {
    points = rings[i];

    for (j = 0, len2 = points.length; j < len2; j++) {
      p = points[j];
      str += (j ? 'L' : 'M') + p.x + ' ' + p.y;
    }

    // closes the ring for polygons; "x" is VML syntax
    str += closed ? (Browser.svg ? 'z' : 'x') : '';
  }

  // SVG complains about empty path strings
  return str || 'M0 0';
}
